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Residual current relays
RD3

Technical features RD3/RD3-48 RD3M/RD3M-48 RD3P/RD3P-48
Operating voltage RD3: 230-400 Vac RD3M: 230-400 Vac RD3P: 230-400 Vac
+10% / -15% +10% / -15% +10% / -15%
RD3-48: 12-48 Vac/ RD3M-48: 12-48 Vac/ RD3P-48: 12-48 Vac/
Vdc +10% / -15% Vdc +10% / -15% Vdc +10% / -15%
Auxiliary supply frequency 50-60 Hz
Frequency filter - Yes Yes
RD3
Type A (up to IDn=5 A)
AC (for higher current)
Operating temperature -25….+70 °C
Power consumption <3.6 W (RD3, RD3M, RD3P),
<600 mW RD3-48, RD3M-48, RD3P-48)
Sensitivity settings IDn 0.03-0.1-0.3-0.5-1-2-3-5-10-30 A
Tripping time settings Dt 0-0.06-0.2-0.3-0.5-1-2-3-5-10 s
Pre-alarm threshold - 60% 60%
Max. resistance connection 3 Ω
between toroidal transfor-
mer and relay
RD3M
Max. length connection of 15 m
remote reset button
Output Contact capacity 8 A, 250 V a.c.
(7-8-9); (10-11-12)
Led bar indicator - - Yes
Max. cable terminals section 2.5 mm²
Modules 3
Dimensions 52.8 × 85 × 64.7 mm
Protection degree IP20
Standards IEC/EN 60947-2 annex. M; IEC/EN 62020
RD3P
RD3 residual current relays
The RD3 family of electronic residual current relays provides residual current protection
and monitoring functions according to IEC/EN 60947-2:2006 annex M when used in
conjunction with external toroids belonging to TR family, all S 200 miniature circuit
breakers and Tmax/XT range moulded case devices up to T5/XT4, for industrial installations.
The RD3 residual current relays can provide status indications through two output contacts.

Operating voltage Bbn Order details Price Weight Pack
8012542 1 piece 1 piece unit
[V] EAN Type code Order code [kg] pc.
12-48 a.c./d.c. 748236 RD3-48 2CSJ201001R0001 0.13 1
230-400 a.c. 734833 RD3 2CSJ201001R0002 0.25 1
12-48 a.c./d.c. 733935 RD3M-48 2CSJ202001R0001 0.13 1
230-400 a.c. 747031 RD3M 2CSJ202001R0002 0.25 1
12-48 a.c./d.c. 734734 RD3P-48 2CSJ203001R0001 0.13 1
230-400 a.c. 733836 RD3P 2CSJ203001R0002 0.25 1